Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
doc chieu » doc hieu, doi chieu, toc thieu
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc chieu xanh - canh trinh va ((thong cong) or (dung cong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc chieu xanh - canh trinh va ((thong cong) OR (dung cong)) tac toan ban.
• Adding a wildcard symbol may retrieve word variants: doc chieu xanh - canh trinh va ((thong cong) or (dung cong)) tac toan ban*.